They did not say any such thing. They gave parameters of what immunity is and isn't. The left is losing it, Biden lied today in his comments and the usual suspects are too.
He said,
“I know I will respect the limits of presidential power as I have for the three-and-a-half years, but any president, including Donald Trump, will now be free to ignore the law,
This is untrue, nowhere in the decision does it say Presidents can ignore the law. It says the president is immune when doing his constitutional or congressional mandated duties. Those are lawful by definition.